High-pressure piston



Dec.

T B L 1,517,593

. .s ATE HIGH PRESSURE PISTON Filed Oct. 23. 1923 I l, I I I F PI 7 (J l'l' v I I I /0 I. w l II II I UN III 7 (9 /Z Fig.2.

INVENTORQ T homasB..5'late A TTORNEYS.

use on'all automatic or by raulic pistons ret sted ne. 2,f1 92e. i, i 1 1,517,593 [UNITED STATES-"PATENT oFFlcE.

:rnomas ZB. SLATE, or ELMHURST, NEW YORK, ASSIGNOR, BY MESNE AssIeNMEnrs, 'ro PRIEST-AIR CORPORATION, or NEW YORK, N. Y., A.:CORPORATIQN or DELA- Hron-rnnssunn 'rIs'roN. Application filed October as, 1923. Serial No. 670,274.

' To all whom it may concern; tion is drawn to the fact thatrubber washer 55 Be it known that I, THOMAS B. SLATE, 8 and packing ring 6 make an absolute seal a citizen of the UnitedStates, residing at between spring plate 9 and piston head 4. Elmhurst, Long Island in the county. of This is necessary to make the piston .5 [Queens and State of" ew York, have 'inoperative.

vented a new and useful High-Pressure What I claim isf 60, Piston, of which the following is a speci; 1. In a high pressure piston, the combinafication tion of a piston having an' annular periph- 1 The object of my invention is to provide eral groove, a resilient packing ring mounted a piston having anabsohite seal or pressure in said. groove, a spring plate in contact and to provide novelresilient means for ,obwith said packing ring, a resilientwasher 6 taining such a seal in a high pressure piston. on the side of thespring plate nearest the .I attain these and other objects of my'inpiston spacing it from the piston to provention by. the mechanism illustrated in the vide an air chamber between thepiston, the accompanying drawings, of wh1ch I spring plate, the packingring and the re- F'gure 1 is a vertical section through a silient washer, spacing elements for the op- 7 cylinder showing my piston in side elevaposite side of the spring plate and the inner tion; and annular edge thereof, and a piston assembly Fig. 2 is a transverse section through my plate in contact with one of said spacing piston showing the Working principle of elements.

same. 2. In a high pressure piston, the combina- 7 Like numerals indicate like parts in each tion with a piston rod having a reduced of the views. v threaded end, of a piston operatively mount- Referring to the accompanying drawings, 'ed on the end-of said piston rod, said piston- 8, 1 represents a conventional cylinder in which having an annular groove extending inward the pistonoperates, and 2 represents a confrom its peripheral surface, a spring plate, v entional piston rod' having a reduced spaced resilient elementsinterposed between H threaded end 3 to engage the piston. I prothe spring plate and the piston, one of said vide a piston head 4 having an annular peelements being in operative contact. with the 30 ripheral groove- 5 to. receive the resilient surface of the cylinder in which the piston packing ring 6. Iprovide a metal spacing operates, a spacing Washer engaging the ring 7, a rubber Washer 8 encircling ring inner edge of the spring plate, and a sec- 7, and a spring plate 9 Which in operation ond metal spacing. washer engaging the may adopt a slightly convex contour. I under side of the spring plate. 35 also provide a metal spacing Washer 10 3. In a high pressure piston, the combinaunder the inner portion of plate 9, the inner tion with a piston rod having a reduced edge of which contacts with the metal spacthreaded end,-'of'a piston operatively mounting washer 7, as shown in Fig. 2. I further. ed on; the end of said piston rod, said piston provide a metal plate 11 acting as .a lock nut. having an annular groove extendinginward to or piston assembly element. A space 12 is from its peripheral surface, a spring plate,

left betweenspringplate 9 and piston head 4 spaced resilient elements interposed between I to allow pressureun'der the piston in operathe sprin plate and the piston, one of said tion to compress the packing ring 6 accordelements being in operative contact with the ing to the amount of pressure applied to the surface of the cylinder in which the piston 4.5 piston. I' provide a vent'hole let through operates, a spacing .washer engaging the piston 4 to allow the air caged in space 12 to inner edge of the spring plate, a second escape, giving full effect of compression metal spacing Washer engaging the under pressure on'spring plate 9. 7 side of the spring plate, and a lock plate This invention is especiall adapted for en agin on the'threaded end of the piston rod to Irold the piston elements in their where an absolute seal or" pressureis reoperative assembled position, the piston hav- 1 5 quired, but-is especially valuable as in pneu-- ing a vent hole for the escape of air in matic jacks, pneumatic hoists, and'all types theair space between the resilient elements ofhy'draulic lifts or hoists. Especial atten- ,when the piston is under'pressure.

4: In a high pressure piston; the combina on the side of the spring plate nearest the piston spacing it from the piston to providean air chamber between the piston, the spring washer, spacing elements for the opposite 10 side of the s rln'g plate and the inner annular edge t ereof, and a piston assembly plate in contact with one of said spacing elements, the piston having a vent hole for the escape of air in the air space between the resilient elements 'when the piston is under pressure. plate, the packing ring and -theresilient THOMAS B. SLATE. 

